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import tkinter as tk

class Window:

def __init__(self, toplevel):

# create a frame that is a conteiner to widgets

self.frame = tk.Frame(toplevel)

# 'pack' is a geometry manager. there are 3 types:

# 1.pack: tk places the widgets for you, but you can manage a few parameters

# 2.place: you can explicitly define position of the widget in window

# 3.grid: you can place widgets on window in a grid

self.frame.pack()

# create a widget, in this case a label

self.lbl1 = tk.Label(self.frame, text='Click to turn green')

self.lbl1['width'] = 26

self.lbl1['height'] = 3

# paint background color

self.lbl1['bg'] = 'yellow'

self.lbl1.pack(fill=tk.X, padx=10, pady=5)

# create another widget, a button

self.btn = tk.Button(self.frame, text='Click here!')

# a handler that trigger a event 'change_color' when btn is clicked

self.btn.bind("<Button-1>", self.change_color)

self.btn.pack(fill=tk.X, padx=10, pady=5)

def change_color(self, event):

if self.lbl1['bg'] == 'yellow':

self.lbl1['bg'] = 'green'

self.lbl1['text'] = 'Click to turn yellow'

else:

self.lbl1['bg'] = 'yellow'

self.lbl1['text'] = 'Click to turn green'

root = tk.Tk()

Window(root)

root.mainloop()